Apparatus for cutting keyways in pulleys and the like.



E. RAU, DEC'D.

A. W. EAU, ADMINISTRATOR.

APPARATUS FOR CUTTING KBYWAYS IN PULLBYS AND THE LIKE.

I l APPLICATION FILED SEPT. 7, 1911. Patented D 8, Q J

5 vwamtom l'mamze? aw. 951 215 5mm; &

THE NORRIS PETERS c0. PNOTD-LITHOT, WASHINGTON, n C.

a TED STATES PATENT ()FFIOE.

EMANUEL RAU, OF NEW YORK, N. Y.; ALEXANDER W. RAU ADMINISTRATOR OF SAID EMANUEL RAU, DECEASED.

APPARATUS FOR CUTTING KEYWAYS IN PULLEYS AND THE LIKE. 2

Application filed September 7, 1911.

To all whom it may concern Be it known that I, EMANUEL RAU, a citizen of the United States, residing in the borough of Brooklyn, in the county of Kings, city and State of New York, have invented new and useful Improvements in Apparatus for Cutting Keyways in Pulleys and the-like, of which the following is a specification.

This invention relates to apparatus to cut keywa-ys in pulleys sheaves and the like, and is in the nature of a hack saw to which purpose it may be readily adapted, and it is the object of the invention to provide an apparatus of this character which is simple and cheap in construction and efficient in operation.

With this object in View I provide a suitable bed and mount thereon a reciprocable carriage, suitable means being provided to reciprocate the same, and fix to said bed a holder to which the work is clamped. A suitable cutter carrier, in the present instance a saw -blade carryingframe, is mounted on the carriage to have vertical adjustment, with means to adjust the carrier and limit the movement thereof.

In the drawings accompanying and forming a part of this specification, Figure 1 is a perspective view of my improved apparatus, showing a pulley clamped to the workholder and a keyway being cut therein. Figs. 2 and 3 are perspective views of different cutters; and Fig. 4: is a detail view to illustrate the means to releasably connect acutter to its carrier.

Similar characters of reference designate like parts throughout the different views of the drawings.

In the embodiment of my invention illustrated in the drawings I have shown the same as comprising a bed 5 supported upon standards 6 which may be constructed inte gral with the bed. Mounted in ways 7 on said bed is a reciprocable carriage 8 having a crank and pitman connection with the shaft of a driving pulley 9 connected by a belt to any suitable source of power. The movements of the carriage are controlled by a lever 10.

A pair of vertical posts 11, 11 are fixed in the carriage 8 upon which posts is mounted a cutter-carrier 12, in the present instance a saw-blade carrying-frame, said carrier having vertical sliding movements on the posts,

Specification of Letters Patent.

Serial No. 648,138. r

and said posts being connected at their upper ends by a releasable bar 17. A cutter 13 is releasably connected to said carrier by.

means of a screw 14 at one end, the other end of which is clamped thereto by a clamping the movement thereof and the cutter is al- Patented Dec. 8, 1914:.

ways parallel with the movement of the carriage assuring a straight cut.

A work-holder 18 is fixedto the bed5 to which the object, in the present instance a pulley 19, is secured by means of a pair of clamping hooks 20, the holder being provided with a number of holes for the reception of the clamping hooks to accommodate the holder to pulleys of varying sizes. The cutter 13 passes through the bore of the hub of the pulley and as the cutter carrier and carriage are reciprocated moves back and forth therewith.

In order that the apparatus may be adapted to cut keyways in pulleys of varying sizes, the posts 11 are made of considerable length to permit of the up and down adjustment of the cutter carrier thereon. To adjust said carrier I provide a lead screw 21 rotatably mounted on the carriage 8 to extend between the posts and parallel therewith and passing through the cutter carrier. The lead screw is provided with a hand wheel 22 and a nut 23. To adjust the carrier the nut 23 is held by one hand and the lead screw is rotated by means of the handwheel 2-2 with the other hand.

hen a keyway is to be cut in a pulley the distance between the perimeter thereof and the outside of the bore in the hub is ascertained when the cutter is set to approximately said distance from the bed 5 by placing the hand on the nut 23 and retating the lead screw 21 with the other hand either to the right or left according as to whether it is desired to raise or lower the cutter carrier. The cutter is then released by the clamping screw 16 and the pulley slipped thereon and clamped in position to the work holder when the cutter is again secured in place. The nut 23 also serves as a gage to limit the depth of the out. Assuming that the depth of the keyway is to be one-quarter of an inch. The cutter carrier is set in the manner hereinbefore set forth so that the cutter will rest upon the work when the nut is rotated so that it is one-quarter of an inch below the carrier and secured in place, by theset screw 52A, as clearly shown in Fig. 1; As the cutprogresses the cutter carrier is automatically lowered until it restsnpon the nut23, and

while the cutter will still reciprocate the.

cut will progress no farther.

In order that the cutter may work efli ciently it is necessary that'pressure is applied thereto as it reciprocates, and for this purpose I provide a spring 25 confined between the connecting bar 17 and the cutter carrier. It is often found necessary, owing to the character of the metal of which the object beingworked is made, that greater pressure be applied to the cutter and for this purpose I provide a weight'26 adjustable along the cutter carrier and secured in place by a set-screw 275 the weight being adjusted inward or outward according to the pressure with 'Which it is desired the cutter to bear upon the work. The cutters are made of difierent widths so as to make cuits-of different*width as is shown in Figs. 2 and 8;

one of the posts 11 and secured to the top of the other post by a screw, said'bar having a cut out portion for the reception of the lead screw. When the spring has been removed,

Copies of this patent maybe obtained for I Should it be desired to have the cutter bear. on the work with a very light pressurerthe spring 25 maybe removedby removing the connecting bar 17 one end of which is "screw threaded on to the top of' or a weaker one substituted, the bar is again secured in place.

Having thus described my invention, I

claim:

In apparatus ofthe class specified, the

combination with a reciprocablecarriage havlng apalriof vertical posts; a-sawblade carrier mounted on said'posts to have vertical adjustment thereon; a bar extending across and.connected}to the upper ends qof said posts; a-leadscrew rotatably mounted; at its lower end in the carriage to extend" between the posts and passingthrough the carrier but having no connection therewith; a spring coiled about the lead screw and-confined between the carrier and 1 cross bar-to eXerta downward pressure. on the saw blade carrier; and'a nut on-the lead'screw below the carrier, said nut* beingadjustable to limit the downward movement of'the'carrier,on the post; substantially as and-for the purpose specified;

EMANUEL RAU. Witnesses R. PITTMAN, HERDLAN' H. PIEPER':

five cents each; by-addressing the commissioner of Patents Washingtomn-OP If desired .the bore in the hub oftthe. pnlley'may be provided with a" 

